On 20 September 1527 Bona Sforza, Queen of Poland, fell from her horse during hunting party in Niepołomice Forest near Cracow. IOTL as result of that accident pregnant Bona lost her child and ability to have more. Queen herself also was close to death and was seriously ill for few weeks. So what if Queen has not survived? Sigismund I loved both his wives, so he would mourn her and not be very willing to remarry, but nobles of Poland could eventually convince him, that he should find new wife to secure future of his dynasty. Sigismund was 60 years old then, but he was man of iron health-he liked hunting, thus was physically active, very rarely was ill and had never drunk alcohol, like his father Casimir IV, grandfather Jogaila and great-grandfather Algirdas. Also, his grandfather had 3 kids in 3 years with his fourth wife, when he was at least 62-65 years old, so more Jagiellon kids are not ruled out.
But more immediately results of Bona's death are, among others, lack of election of Sigismund Augustus to the Polish throne in 1529 and his coronation following year. That was Bona's idea. For one time gain (and unnecessary one-Sigismund Augustus was only son of his father and heir to hereditary Lithuanian throne, it was obvious, that he'll succeede his dad also in Poland) she paid huge price-abolition of any future vivente rege elections and change of method of election-instead of tiny council, masses of nobles were meant to elect future kings. Although in 1527 it was already decided, that Sigismund Augustus would be Grand Duke of Lithuania-he was inthronised in 1529 in Vilnius, so even if Sigismund I remarries and has sons with his third wife, they'll be born to late to change it. So in 1548 Poland and Lithuania would not split like they usually did, when Jagiellon monarch died leaving more than one son. Without Bona Sigismund I's politics would propably be more pro-Habsburg, he would not marry his daughter to Hungarian anti-King Zapolya. Also personality of Sigismund Augustus without overprotective Bona would be quite different (much better, I think) and things like his marriage to Barbara Radziwiłł would never happen.
 
For Sigismund I's third wife I'm hestitating between two candidates-Anna of Mazovia, sister of last duke of recently incorpirated Duchy of Mazovia, and Margaret of Brandenburg, daughter of Elector Joachim I (I'm leaning towards the latter, she is much younger, could marry Sigismund as part of double Jagiellon-Hohenzollern marriage alongside Hedwig-Joachim II match).
 
For Sigismund I's third wife I'm hestitating between two candidates-Anna of Mazovia, sister of last duke of recently incorpirated Duchy of Mazovia, and Margaret of Brandenburg, daughter of Elector Joachim I (I'm leaning towards the latter, she is much younger, could marry Sigismund as part of double Jagiellon-Hohenzollern marriage alongside Hedwig-Joachim II match).
Eleanor of Austria, Charles's V eldest sister is already engaged but not yet married to Francis I of France (and that wedding can be replaced by the original proposal of a wedding between the Dauphin Francis and Maria of Portugal, Eleanor's daughter). Sure she is almost 30 years old but is a very prestigious match and she has still at least 5/6 years for having more children (and Sisigmund would be a much better match for her than Francis as at least he would not hate her for being Charles V's sister)
 
Eleanor also seems to be good option, Habsburgs would push for it, and Sigismund's advisor and friend (and Habsburg supporter) chancellor Krzysztof Szydłowiecki would certainly urge King to marry her.
 
Eleanor also seems to be good option, Habsburgs would push for it, and Sigismund's advisor and friend (and Habsburg supporter) chancellor Krzysztof Szydłowiecki would certainly urge King to marry her.
At the time of ATL death of Bona Austria and Poland had already started talks for a wedding between Sigismund Augustus and his OTL first wife aka Elisabeth of Austria, the eldest daughter of Ferdinand and Anna and so niece of Eleanor so the offer of the aunt as new bride for the widowed father would be quite logical and for France the wedding between the Dauphin and Maria would be enough and considering who the in 1526 the eight years old Dauphin (and Duke of Brittany) and the seven years old Duke of Orléans were consigned to Charles in exchange of their father’s freedom and they are still in Spain Charles can very well marry the Dauphin to Maria before sending the boys back in France either with the young Dauphine and Duchess of Brittany or with the girl (born in middle 1521) to follow after her fourteen birthday
 
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